CN114765768B - Network selection method and device - Google Patents

Abstract

A network selection method and electronic equipment relate to the technical field of wireless communication, and the network selection method comprises the following steps: acquiring an identification of a home public mobile network (HPLMN); acquiring a land public mobile network (PLMN) list, wherein PLMNs in the PLMN list are arranged in sequence, and the PLMNs have identifications; determining whether the PLMN list includes an HPLMN; and selecting the HPLMN when the PLMN list is determined to contain the HPLMN. Thus, the terminal can preferentially select to register to the optimal PLMN network, and initiate an emergency call request through the selected PLMN network, thereby improving the success rate of the emergency call of the terminal.

Description

Network selection method and device

Technical Field

The present invention relates to the field of wireless communications technologies, and in particular, to a network selection method and an electronic device.

Background

As network deployment becomes more complex, there may be situations where multiple operators' networks are simultaneously covered in the same area. In this case, only one set of access networks needs to be built in the same area, and different operators share the access network, the frequency point and the cell in a multi-operator sharing network (multi-operator core network, MOCN) mode, so that the operation cost is reduced. Emergency calls are special call services in which a user dials a number such as 110, 120, 911, etc. through a terminal while the user is in a flight mode when encountering an emergency such as medical assistance, fire, etc. When the user starts the emergency call function, the terminal firstly initiates an emergency call service request to the base station, and the base station side establishes an emergency call session according to the emergency number of the terminal call to complete the emergency call flow. When the user needs to use the emergency call function in the flight mode, the terminal needs to exit the flight mode in time, initiate the start-up network search, and initiate the emergency call after the network residence is successful.

In a MOCN, the same cell has a plurality of land public mobile networks (public land mobile network, PLMNs), which refer to networks established and operated by the government or its licensed operators for the purpose of providing land mobile services to the public. The PLMNs have unique PLMN IDs for identifying different PLMNs. The user home land public mobile network (home public land mobile network, HPLMN) is a PLMN provided by the user home network operator. The terminal may select and register with the non-HPLMN and may cause the emergency call to fail when the terminal initiates an emergency call request through the non-HPLMN.

Disclosure of Invention

In view of this, the embodiment of the present invention provides a network selection method, by which a terminal can preferentially select and register to an optimal PLMN network, and initiate an emergency call request through the selected PLMN network, and the selected optimal PLMN network receives the emergency call request and executes an emergency call task through an emergency call system of the network, thereby improving the success rate of emergency call of the terminal.

In a first aspect, an embodiment of the present application provides a network selection method, where the method includes: acquiring an identification of a home public mobile network (HPLMN); acquiring a land public mobile network (PLMN) list, wherein PLMNs in the PLMN list are arranged in sequence, and the PLMNs have identifications; determining whether the PLMN list includes an HPLMN; and selecting the HPLMN when the PLMN list is determined to contain the HPLMN. By the setting mode, the terminal can select to register to the HPLMN, and when the terminal initiates the emergency call through the HPLMN, the success rate of the emergency call can be improved.

In a possible implementation manner of the first aspect, the method further includes: determining whether the PLMN list contains an Equivalent Home Public Land Mobile Network (EHPLMN) when it is determined that the PLMN list does not contain the HPLMN; and selecting the EHPLMN when the PLMN list is determined to contain the EHPLMN. Through the setting mode, the terminal can select to register to the EHPLMN, and when the terminal initiates an emergency call through the EHPLMN, the success rate of the emergency call can be improved.

According to a first aspect, or any implementation manner of the first aspect, the method further includes: and when the PLMN list is determined not to contain the EHPLMN, selecting PLMNs in the PLMN list according to the sequence of the PLMNs in the PLMN list.

According to a first aspect, or any implementation manner of the first aspect, the determining whether the PLMN list includes the HPLMN includes: analyzing the PLMN list to obtain the identification of the PLMN; inquiring whether the identification of the HPLMN is contained or not according to the identification of the PLMN in the PLMN list; and determining whether the PLMN list contains the HPLMN according to the query result.

According to a first aspect, or any implementation manner of the first aspect, the determining whether the PLMN list includes the EHPLMN includes: analyzing the PLMN list to obtain the identification of the PLMN; inquiring whether the identification of the EHPLMN is contained or not according to the identification of the PLMN in the PLMN list; and determining whether the PLMN list contains the EHPLMN according to the query result.

According to a first aspect, or any implementation manner of the first aspect, the method further includes: before acquiring the identification of the HPLMN, detecting the operation of starting an emergency call function by a user; and switching off the flight mode between the steps of acquiring the identification of the HPLMN and acquiring the PLMN list.

According to a first aspect, or any implementation of the first aspect above, the method is applied to a multi-operator shared network (MOCN).

In a second aspect, an embodiment of the present application provides a terminal, where the terminal includes a touch screen, a memory, and a processor; wherein the storage stores one or more computer programs; the processor is configured to: acquiring an identification of a home public mobile network (HPLMN); acquiring a land public mobile network (PLMN) list, wherein PLMNs in the PLMN list are arranged in sequence, and the PLMNs have identifications; determining whether the PLMN list includes an HPLMN; and selecting the HPLMN when the PLMN list is determined to contain the HPLMN. By the setting mode, the terminal can select to register to the HPLMN, and when the terminal initiates the emergency call through the HPLMN, the success rate of the emergency call can be improved.

In a possible implementation manner of the second aspect, the processor is further configured to: determining whether the PLMN list contains an Equivalent Home Public Land Mobile Network (EHPLMN) when it is determined that the PLMN list does not contain the HPLMN; and selecting the EHPLMN when the PLMN list is determined to contain the EHPLMN. Through the setting mode, the terminal can select to register to the EHPLMN, and when the terminal initiates an emergency call through the EHPLMN, the success rate of the emergency call can be improved.

According to a second aspect, or any implementation of the second aspect above, the processor is further configured to: and when the PLMN list is determined not to contain the EHPLMN, selecting PLMNs in the PLMN list according to the sequence of the PLMNs in the PLMN list.

According to a second aspect, or any implementation of the second aspect above, the processor is further configured to: analyzing the PLMN list to obtain the identification of the PLMN; inquiring whether the identification of the HPLMN is contained or not according to the identification of the PLMN in the PLMN list; and determining whether the PLMN list contains the HPLMN according to the query result.

According to a second aspect, or any implementation of the second aspect above, the processor is further configured to: analyzing the PLMN list to obtain the identification of the PLMN; inquiring whether the identification of the EHPLMN is contained or not according to the identification of the PLMN in the PLMN list; and determining whether the PLMN list contains the EHPLMN according to the query result.

According to a second aspect, or any implementation of the second aspect above, the processor is further configured to: before acquiring the identification of the HPLMN, detecting the operation of starting an emergency call function by a user; and switching off the flight mode between the steps of acquiring the identification of the HPLMN and acquiring the PLMN list.

By the scheme, when the terminal can start the emergency call function of the terminal in the MOCN network, the terminal can select the optimal PLMN network, and the terminal can initiate an emergency call request through the selected HPLMN network or the EHPLMN network, and the selected HPLMN network or the EHPLMN network executes the emergency call task through an emergency call system of the network, so that the success rate of emergency call is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention, the drawings that are required for the description of the embodiments will be briefly described below, it being apparent that the drawings in the following description are only some embodiments of the present invention and that other drawings may be obtained from these drawings by those skilled in the art without inventive faculty.

FIG. 1 is a schematic diagram of an apparatus according to an embodiment of the present application;

FIG. 2 is a block diagram of a software architecture of a device according to an embodiment of the present application;

FIG. 3A is a schematic diagram of an emergency call scenario;

FIG. 3B is a schematic diagram of an emergency call scenario;

Fig. 4 is a flow chart of a network selection method according to an embodiment of the present application;

fig. 5 is a signaling interaction diagram of a network selection method according to an embodiment of the present application.

Detailed Description

The terminology used in the following embodiments of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the specification of the present application and the appended claims, the singular forms "a," "an," "the," and "the" are intended to include, for example, the plural forms "one or more" unless the context clearly dictates otherwise. It should also be understood that the term "and/or" as used in this disclosure refers to and encompasses any or all possible combinations of one or more of the listed items.

Reference in the specification to "one embodiment" or "some embodiments" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and the like in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments" unless expressly specified otherwise. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise.

As used in the following examples, the term "when …" may be interpreted to mean "if …" or "after …" or "in response to determination …" or "in response to detection …" depending on the context. Similarly, the phrase "at the time of determination …" or "if detected (a stated condition or event)" may be interpreted to mean "if determined …" or "in response to determination …" or "at the time of detection (a stated condition or event)" or "in response to detection (a stated condition or event)" depending on the context.

The terms "first," "second," "third," "fourth" and the like in the description and in the claims and in the above drawings, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments described herein may be implemented in other sequences than those illustrated or otherwise described herein.

Embodiments of terminals and methods for using such terminals are described below. In some embodiments, the terminal may be a wireless terminal. A terminal can also be called an electronic device, a subscriber unit, a subscriber station, mobile device, remote station, remote terminal, access terminal, user terminal, communication device, user agent, user device, or User Equipment (UE). The wireless terminal may be a cellular telephone, satellite telephone, cordless telephone, session Initiation Protocol (SIP) phone, personal Digital Assistant (PDA), handheld device having wireless connection capability, computing device, or other processing device connected to a wireless modem. Furthermore, various aspects are described herein in connection with a base station. A base station may be utilized for communicating with wireless terminals and may also be referred to as an access point, a node B, or some other terminology. The base station may be implemented as a radio base station of any suitable radio technology, e.g. a BTS (base transceiver station) of GSM (global system for mobile communications), a NodeB of a HSPA (high speed packet access)/WCDMA (wireless code division multiple access) network, or an eNodeB of an LTE (long term evolution) communication network.

Embodiments of the present application will be described below with reference to the accompanying drawings. It will be apparent that the described embodiments are some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to fall within the scope of the application.

Fig. 1 shows a schematic structure of a terminal 100.

The terminal 100 may include a processor 110, an external memory interface 120, an internal memory 121, a universal serial bus (universal serial bus, USB) interface 130, a charge management module 140, a power management module 141, a battery 142, an antenna 1, an antenna 2, a mobile communication module 150, a wireless communication module 160, an audio module 170, a speaker 170A, a receiver 170B, a microphone 170C, an earphone interface 170D, a sensor module 180, keys 190, a motor 191, an indicator 192, a camera 193, a display 194, and a subscriber identity module (subscriber identification module, SIM) card interface 195, etc. The sensor module 180 may include a pressure sensor 180A, a gyro sensor 180B, an air pressure sensor 180C, a magnetic sensor 180D, an acceleration sensor 180E, a distance sensor 180F, a proximity sensor 180G, a fingerprint sensor 180H, a temperature sensor 180J, a touch sensor 180K, an ambient light sensor 180L, a bone conduction sensor 180M, and the like.

It should be understood that the structure illustrated in the embodiments of the present application does not constitute a specific limitation on the terminal 100. In other embodiments of the application, terminal 100 may include more or less components than shown, or certain components may be combined, or certain components may be split, or different arrangements of components. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

The processor 110 may include one or more processing units, such as: the processor 110 may include an application processor (application processor, AP), a modem processor, a graphics processor (graphics processing unit, GPU), an image signal processor (IMAGE SIGNAL processor, ISP), a controller, a video codec, a digital signal processor (DIGITAL SIGNAL processor, DSP), a baseband processor, and/or a neural-Network Processor (NPU), etc. Wherein the different processing units may be separate devices or may be integrated in one or more processors.

The controller can generate operation control signals according to the instruction operation codes and the time sequence signals to finish the control of instruction fetching and instruction execution.

A memory may also be provided in the processor 110 for storing instructions and data. In some embodiments, the memory in the processor 110 is a cache memory. The memory may hold instructions or data that the processor 110 has just used or recycled. If the processor 110 needs to reuse the instruction or data, it can be called directly from the memory. Repeated accesses are avoided and the latency of the processor 110 is reduced, thereby improving the efficiency of the system.

In some embodiments, the processor 110 may include one or more interfaces. The interfaces may include an integrated circuit (inter-INTEGRATED CIRCUIT, I2C) interface, an integrated circuit built-in audio (inter-INTEGRATED CIRCUIT SOUND, I2S) interface, a pulse code modulation (pulse code modulation, PCM) interface, a universal asynchronous receiver transmitter (universal asynchronous receiver/transmitter, UART) interface, a mobile industry processor interface (mobile industry processor interface, MIPI), a general-purpose input/output (GPIO) interface, a subscriber identity module (subscriber identity module, SIM) interface, and/or a universal serial bus (universal serial bus, USB) interface, among others.

The I2C interface is a bi-directional synchronous serial bus comprising a serial data line (SERIAL DATA LINE, SDA) and a serial clock line (derail clock line, SCL). In some embodiments, the processor 110 may contain multiple sets of I2C buses. The processor 110 may be coupled to the touch sensor 180K, charger, flash, camera 193, etc., respectively, through different I2C bus interfaces. For example: the processor 110 may be coupled to the touch sensor 180K through an I2C interface, so that the processor 110 and the touch sensor 180K communicate through an I2C bus interface to implement a touch function of the terminal 100.

The I2S interface may be used for audio communication. In some embodiments, the processor 110 may contain multiple sets of I2S buses. The processor 110 may be coupled to the audio module 170 via an I2S bus to enable communication between the processor 110 and the audio module 170. In some embodiments, the audio module 170 may transmit an audio signal to the wireless communication module 160 through the I2S interface, to implement a function of answering a call through the bluetooth headset.

PCM interfaces may also be used for audio communication to sample, quantize and encode analog signals. In some embodiments, the audio module 170 and the wireless communication module 160 may be coupled through a PCM bus interface. In some embodiments, the audio module 170 may also transmit audio signals to the wireless communication module 160 through the PCM interface to implement a function of answering a call through the bluetooth headset. Both the I2S interface and the PCM interface may be used for audio communication.

The UART interface is a universal serial data bus for asynchronous communications. The bus may be a bi-directional communication bus. It converts the data to be transmitted between serial communication and parallel communication. In some embodiments, a UART interface is typically used to connect the processor 110 with the wireless communication module 160. For example: the processor 110 communicates with a bluetooth module in the wireless communication module 160 through a UART interface to implement a bluetooth function. In some embodiments, the audio module 170 may transmit an audio signal to the wireless communication module 160 through a UART interface, to implement a function of playing music through a bluetooth headset.

The MIPI interface may be used to connect the processor 110 to peripheral devices such as a display 194, a camera 193, and the like. The MIPI interfaces include camera serial interfaces (CAMERA SERIAL INTERFACE, CSI), display serial interfaces (DISPLAY SERIAL INTERFACE, DSI), and the like. In some embodiments, processor 110 and camera 193 communicate through a CSI interface to implement the photographing function of terminal 100. The processor 110 and the display 194 communicate through a DSI interface to implement the display function of the terminal 100.

The GPIO interface may be configured by software. The GPIO interface may be configured as a control signal or as a data signal. In some embodiments, a GPIO interface may be used to connect the processor 110 with the camera 193, the display 194, the wireless communication module 160, the audio module 170, the sensor module 180, and the like. The GPIO interface may also be configured as an I2C interface, an I2S interface, a UART interface, an MIPI interface, etc.

The USB interface 130 is an interface conforming to the USB standard specification, and may specifically be a Mini USB interface, a Micro USB interface, a USB Type C interface, or the like. The USB interface 130 may be used to connect a charger to charge the terminal 100, or may be used to transfer data between the terminal 100 and a peripheral device. And can also be used for connecting with a headset, and playing audio through the headset. The interface may also be used to connect other electronic devices, such as AR devices, etc.

It should be understood that the interfacing relationship between the modules illustrated in the embodiment of the present application is only illustrative, and does not limit the structure of the terminal 100. In other embodiments of the present application, the terminal 100 may also use different interfacing manners in the above embodiments, or a combination of multiple interfacing manners.

The charge management module 140 is configured to receive a charge input from a charger. The charger can be a wireless charger or a wired charger. In some wired charging embodiments, the charge management module 140 may receive a charging input of a wired charger through the USB interface 130. In some wireless charging embodiments, the charge management module 140 may receive wireless charging input through a wireless charging coil of the terminal 100. The charging management module 140 may also supply power to the electronic device through the power management module 141 while charging the battery 142.

The power management module 141 is used for connecting the battery 142, and the charge management module 140 and the processor 110. The power management module 141 receives input from the battery 142 and/or the charge management module 140 to power the processor 110, the internal memory 121, the display 194, the camera 193, the wireless communication module 160, and the like. The power management module 141 may also be configured to monitor battery capacity, battery cycle number, battery health (leakage, impedance) and other parameters. In other embodiments, the power management module 141 may also be provided in the processor 110. In other embodiments, the power management module 141 and the charge management module 140 may be disposed in the same device.

The wireless communication function of the terminal 100 may be implemented by the antenna 1, the antenna 2, the mobile communication module 150, the wireless communication module 160, a modem processor, a baseband processor, and the like.

The antennas 1 and 2 are used for transmitting and receiving electromagnetic wave signals. Each antenna in terminal 100 may be configured to cover a single or multiple communication bands. Different antennas may also be multiplexed to improve the utilization of the antennas. For example: the antenna 1 may be multiplexed into a diversity antenna of a wireless local area network. In other embodiments, the antenna may be used in conjunction with a tuning switch.

The mobile communication module 150 may provide a solution including 2G/3G/4G/5G wireless communication applied to the terminal 100. The mobile communication module 150 may include at least one filter, switch, power amplifier, low noise amplifier (low noise amplifier, LNA), etc. The mobile communication module 150 may receive electromagnetic waves from the antenna 1, perform processes such as filtering, amplifying, and the like on the received electromagnetic waves, and transmit the processed electromagnetic waves to the modem processor for demodulation. The mobile communication module 150 can amplify the signal modulated by the modem processor, and convert the signal into electromagnetic waves through the antenna 1 to radiate. In some embodiments, at least some of the functional modules of the mobile communication module 150 may be disposed in the processor 110. In some embodiments, at least some of the functional modules of the mobile communication module 150 may be provided in the same device as at least some of the modules of the processor 110.

The modem processor may include a modulator and a demodulator. The modulator is used for modulating the low-frequency baseband signal to be transmitted into a medium-high frequency signal. The demodulator is used for demodulating the received electromagnetic wave signal into a low-frequency baseband signal. The demodulator then transmits the demodulated low frequency baseband signal to the baseband processor for processing. The low frequency baseband signal is processed by the baseband processor and then transferred to the application processor. The application processor outputs sound signals through an audio device (not limited to the speaker 170A, the receiver 170B, etc.), or displays images or video through the display screen 194. In some embodiments, the modem processor may be a stand-alone device. In other embodiments, the modem processor may be provided in the same device as the mobile communication module 150 or other functional module, independent of the processor 110.

The wireless communication module 160 may provide solutions for wireless communication including wireless local area network (wireless local area networks, WLAN) (e.g., wireless fidelity (WIRELESS FIDELITY, wi-Fi) network), bluetooth (BT), global navigation satellite system (global navigation SATELLITE SYSTEM, GNSS), frequency modulation (frequency modulation, FM), near field communication (NEAR FIELD communication, NFC), infrared (IR), etc., applied on the terminal 100. The wireless communication module 160 may be one or more devices that integrate at least one communication processing module. The wireless communication module 160 receives electromagnetic waves via the antenna 2, modulates the electromagnetic wave signals, filters the electromagnetic wave signals, and transmits the processed signals to the processor 110. The wireless communication module 160 may also receive a signal to be transmitted from the processor 110, frequency modulate it, amplify it, and convert it to electromagnetic waves for radiation via the antenna 2.

In some embodiments, antenna 1 and mobile communication module 150 of terminal 100 are coupled, and antenna 2 and wireless communication module 160 are coupled, such that terminal 100 may communicate with a network and other devices via wireless communication techniques. The wireless communication techniques can include the Global System for Mobile communications (global system for mobile communications, GSM), general packet radio service (GENERAL PACKET radio service, GPRS), code division multiple access (code division multiple access, CDMA), wideband code division multiple access (wideband code division multiple access, WCDMA), time division code division multiple access (time-division code division multiple access, TD-SCDMA), long term evolution (long term evolution, LTE), BT, GNSS, WLAN, NFC, FM, and/or IR techniques, among others. The GNSS may include a global satellite positioning system (global positioning system, GPS), a global navigation satellite system (global navigation SATELLITE SYSTEM, GLONASS), a beidou satellite navigation system (beidou navigation SATELLITE SYSTEM, BDS), a quasi zenith satellite system (quasi-zenith SATELLITE SYSTEM, QZSS) and/or a satellite based augmentation system (SATELLITE BASED AUGMENTATION SYSTEMS, SBAS).

Terminal 100 implements display functions via a GPU, display 194, and application processor, etc. The GPU is a microprocessor for image processing, and is connected to the display 194 and the application processor. The GPU is used to perform mathematical and geometric calculations for graphics rendering. Processor 110 may include one or more GPUs that execute program instructions to generate or change display information.

The display screen 194 is used to display images, videos, and the like. The display 194 includes a display panel. The display panel may employ a Liquid Crystal Display (LCD) CRYSTAL DISPLAY, an organic light-emitting diode (OLED), an active-matrix organic LIGHT EMITTING diode (AMOLED), a flexible light-emitting diode (FLED), miniled, microLed, micro-oLed, a quantum dot LIGHT EMITTING diode (QLED), or the like. In some embodiments, the terminal 100 may include 1 or N display screens 194, N being a positive integer greater than 1.

The terminal 100 may implement photographing functions through an ISP, a camera 193, a video codec, a GPU, a display 194, an application processor, and the like.

The ISP is used to process data fed back by the camera 193. For example, when photographing, the shutter is opened, light is transmitted to the camera photosensitive element through the lens, the optical signal is converted into an electric signal, and the camera photosensitive element transmits the electric signal to the ISP for processing and is converted into an image visible to naked eyes. ISP can also optimize the noise, brightness and skin color of the image. The ISP can also optimize parameters such as exposure, color temperature and the like of a shooting scene. In some embodiments, the ISP may be provided in the camera 193.

The camera 193 is used to capture still images or video. The object generates an optical image through the lens and projects the optical image onto the photosensitive element. The photosensitive element may be a charge coupled device (charge coupled device, CCD) or a Complementary Metal Oxide Semiconductor (CMOS) phototransistor. The photosensitive element converts the optical signal into an electrical signal, which is then transferred to the ISP to be converted into a digital image signal. The ISP outputs the digital image signal to the DSP for processing. The DSP converts the digital image signal into an image signal in a standard RGB, YUV, or the like format. In some embodiments, terminal 100 may include 1 or N cameras 193, N being a positive integer greater than 1.

The digital signal processor is used for processing digital signals, and can process other digital signals besides digital image signals. For example, when the terminal 100 selects a frequency bin, the digital signal processor is used to fourier transform the frequency bin energy, etc.

Video codecs are used to compress or decompress digital video. The terminal 100 may support one or more video codecs. In this way, the terminal 100 may play or record video in a variety of encoding formats, such as: dynamic picture experts group (moving picture experts group, MPEG) 1, MPEG2, MPEG3, MPEG4, etc.

The NPU is a neural-network (NN) computing processor, and can rapidly process input information by referencing a biological neural network structure, for example, referencing a transmission mode between human brain neurons, and can also continuously perform self-learning. Applications such as intelligent cognition of the terminal 100 can be implemented by the NPU, for example: image recognition, face recognition, speech recognition, text understanding, etc.

The external memory interface 120 may be used to connect an external memory card, such as a Micro SD card, to realize the memory capability of the extension terminal 100. The external memory card communicates with the processor 110 through an external memory interface 120 to implement data storage functions. For example, files such as music, video, etc. are stored in an external memory card.

The internal memory 121 may be used to store computer executable program code including instructions. The internal memory 121 may include a storage program area and a storage data area. The storage program area may store an application program (such as a sound playing function, an image playing function, etc.) required for at least one function of the operating system, etc. The storage data area may store data (e.g., audio data, phonebook, etc.) created during use of the terminal 100, and the like. In addition, the internal memory 121 may include a high-speed random access memory, and may further include a nonvolatile memory such as at least one magnetic disk storage device, a flash memory device, a universal flash memory (universal flash storage, UFS), and the like. The processor 110 performs various functional applications of the terminal 100 and data processing by executing instructions stored in the internal memory 121 and/or instructions stored in a memory provided in the processor.

The terminal 100 may implement audio functions through an audio module 170, a speaker 170A, a receiver 170B, a microphone 170C, an earphone interface 170D, an application processor, and the like. Such as music playing, recording, etc.

The audio module 170 is used to convert digital audio information into an analog audio signal output and also to convert an analog audio input into a digital audio signal. The audio module 170 may also be used to encode and decode audio signals. In some embodiments, the audio module 170 may be disposed in the processor 110, or a portion of the functional modules of the audio module 170 may be disposed in the processor 110.

The speaker 170A, also referred to as a "horn," is used to convert audio electrical signals into sound signals. The terminal 100 can listen to music or to handsfree calls through the speaker 170A.

A receiver 170B, also referred to as a "earpiece", is used to convert the audio electrical signal into a sound signal. When the terminal 100 receives a telephone call or voice message, it is possible to receive voice by approaching the receiver 170B to the human ear.

Microphone 170C, also referred to as a "microphone" or "microphone", is used to convert sound signals into electrical signals. When making a call or transmitting voice information, the user can sound near the microphone 170C through the mouth, inputting a sound signal to the microphone 170C. The terminal 100 may be provided with at least one microphone 170C. In other embodiments, the terminal 100 may be provided with two microphones 170C, and may implement a noise reduction function in addition to collecting sound signals. In other embodiments, the terminal 100 may be further provided with three, four or more microphones 170C to collect sound signals, reduce noise, identify the source of sound, implement directional recording functions, etc.

The earphone interface 170D is used to connect a wired earphone. The headset interface 170D may be a USB interface 130 or a 3.5mm open mobile electronic device platform (open mobile terminal platform, OMTP) standard interface, a american cellular telecommunications industry association (cellular telecommunications industry association of the USA, CTIA) standard interface.

The pressure sensor 180A is used to sense a pressure signal, and may convert the pressure signal into an electrical signal. In some embodiments, the pressure sensor 180A may be disposed on the display screen 194. Pressure sensor 180A

Such as resistive pressure sensors, inductive pressure sensors, capacitive pressure sensors, etc. The capacitive pressure sensor may be a capacitive pressure sensor comprising at least two parallel plates with conductive material. The capacitance between the electrodes changes when a force is applied to the pressure sensor 180A. The terminal 100 determines the strength of the pressure according to the change of the capacitance. When a touch operation is applied to the display 194, the terminal 100 detects the intensity of the touch operation according to the pressure sensor 180A. The terminal 100 may also calculate the location of the touch based on the detection signal of the pressure sensor 180A. In some embodiments, touch operations that act on the same touch location, but at different touch operation strengths, may correspond to different operation instructions. For example: and executing an instruction for checking the short message when the touch operation with the touch operation intensity smaller than the first pressure threshold acts on the short message application icon. And executing an instruction for newly creating the short message when the touch operation with the touch operation intensity being greater than or equal to the first pressure threshold acts on the short message application icon.

The gyro sensor 180B may be used to determine a motion gesture of the terminal 100. In some embodiments, the angular velocity of terminal 100 about three axes (i.e., x, y, and z axes) may be determined by gyro sensor 180B. The gyro sensor 180B may be used for photographing anti-shake. Illustratively, when the shutter is pressed, the gyro sensor 180B detects the angle of the shake of the terminal 100, calculates the distance to be compensated by the lens module according to the angle, and allows the lens to counteract the shake of the terminal 100 by the reverse motion, thereby realizing anti-shake. The gyro sensor 180B may also be used for navigating, somatosensory game scenes.

The air pressure sensor 180C is used to measure air pressure. In some embodiments, the terminal 100 calculates altitude from barometric pressure values measured by the barometric pressure sensor 180C, aiding in positioning and navigation.

The magnetic sensor 180D includes a hall sensor. The terminal 100 may detect the opening and closing of the flip cover using the magnetic sensor 180D. In some embodiments, when the terminal 100 is a folder, the terminal 100 may detect opening and closing of the folder according to the magnetic sensor 180D. And then according to the detected opening and closing state of the leather sheath or the opening and closing state of the flip, the characteristics of automatic unlocking of the flip and the like are set.

The acceleration sensor 180E may detect the magnitude of acceleration of the terminal 100 in various directions (typically three axes). The magnitude and direction of gravity may be detected when the terminal 100 is stationary. The electronic equipment gesture recognition method can also be used for recognizing the gesture of the electronic equipment, and is applied to horizontal and vertical screen switching, pedometers and other applications.

A distance sensor 180F for measuring a distance. The terminal 100 may measure the distance by infrared or laser. In some embodiments, the terminal 100 may range using the distance sensor 180F to achieve quick focusing.

The proximity light sensor 180G may include, for example, a Light Emitting Diode (LED) and a light detector, such as a photodiode. The light emitting diode may be an infrared light emitting diode. The terminal 100 emits infrared light outward through the light emitting diode. The terminal 100 detects infrared reflected light from nearby objects using a photodiode. When sufficient reflected light is detected, it may be determined that there is an object near the terminal 100. When insufficient reflected light is detected, the terminal 100 may determine that there is no object in the vicinity of the terminal 100. The terminal 100 can detect that the user holds the terminal 100 close to the ear by using the proximity light sensor 180G, so as to automatically extinguish the screen for the purpose of saving power. The proximity light sensor 180G may also be used in holster mode, pocket mode to automatically unlock and lock the screen.

The ambient light sensor 180L is used to sense ambient light level. The terminal 100 may adaptively adjust the brightness of the display 194 according to the perceived ambient light level. The ambient light sensor 180L may also be used to automatically adjust white balance when taking a photograph. The ambient light sensor 180L may also cooperate with the proximity light sensor 180G to detect whether the terminal 100 is in a pocket to prevent false touches.

The fingerprint sensor 180H is used to collect a fingerprint. The terminal 100 can utilize the collected fingerprint characteristics to realize fingerprint unlocking, access an application lock, fingerprint photographing, fingerprint incoming call answering and the like.

The temperature sensor 180J is for detecting temperature. In some embodiments, terminal 100 performs a temperature processing strategy using the temperature detected by temperature sensor 180J. For example, when the temperature reported by the temperature sensor 180J exceeds a threshold, the terminal 100 performs a reduction in performance of a processor located near the temperature sensor 180J in order to reduce power consumption for implementing thermal protection. In other embodiments, when the temperature is below another threshold, the terminal 100 heats the battery 142 to avoid the terminal 100 from being abnormally shut down due to low temperatures. In other embodiments, when the temperature is below a further threshold, terminal 100 performs boosting of the output voltage of battery 142 to avoid abnormal shutdown caused by low temperatures.

The touch sensor 180K, also referred to as a "touch device". The touch sensor 180K may be disposed on the display screen 194, and the touch sensor 180K and the display screen 194 form a touch screen, which is also called a "touch screen". The touch sensor 180K is for detecting a touch operation acting thereon or thereabout. The touch sensor may communicate the detected touch operation to the application processor to determine the touch event type. Visual output related to touch operations may be provided through the display 194. In other embodiments, the touch sensor 180K may be disposed on the surface of the terminal 100 at a different location than the display 194.

The bone conduction sensor 180M may acquire a vibration signal. In some embodiments, bone conduction sensor 180M may acquire a vibration signal of a human vocal tract vibrating bone pieces. The bone conduction sensor 180M may also contact the pulse of the human body to receive the blood pressure pulsation signal. In some embodiments, bone conduction sensor 180M may also be provided in a headset, in combination with an osteoinductive headset. The audio module 170 may analyze the voice signal based on the vibration signal of the sound portion vibration bone block obtained by the bone conduction sensor 180M, so as to implement a voice function. The application processor may analyze the heart rate information based on the blood pressure beat signal acquired by the bone conduction sensor 180M, so as to implement a heart rate detection function.

The keys 190 include a power-on key, a volume key, etc. The keys 190 may be mechanical keys. Or may be a touch key. The terminal 100 may receive key inputs, generating key signal inputs related to user settings and function controls of the terminal 100.

The motor 191 may generate a vibration cue. The motor 191 may be used for incoming call vibration alerting as well as for touch vibration feedback. For example, touch operations acting on different applications (e.g., photographing, audio playing, etc.) may correspond to different vibration feedback effects. The motor 191 may also correspond to different vibration feedback effects by touching different areas of the display screen 194. Different application scenarios (such as time reminding, receiving information, alarm clock, game, etc.) can also correspond to different vibration feedback effects. The touch vibration feedback effect may also support customization.

The indicator 192 may be an indicator light, may be used to indicate a state of charge, a change in charge, a message indicating a missed call, a notification, etc.

The SIM card interface 195 is used to connect a SIM card. The SIM card may be contacted and separated from the terminal 100 by being inserted into the SIM card interface 195 or by being withdrawn from the SIM card interface 195. The terminal 100 may support 1 or N SIM card interfaces, N being a positive integer greater than 1. The SIM card interface 195 may support Nano SIM cards, micro SIM cards, and the like. The same SIM card interface 195 may be used to insert multiple cards simultaneously. The types of the plurality of cards may be the same or different. The SIM card interface 195 may also be compatible with different types of SIM cards. The SIM card interface 195 may also be compatible with external memory cards. The terminal 100 interacts with the network through the SIM card to realize functions such as call and data communication. In some embodiments, the terminal 100 employs esims, i.e.: an embedded SIM card. The eSIM card may be embedded in the terminal 100 and cannot be separated from the terminal 100.

The software system of the terminal 100 may employ a layered architecture, an event driven architecture, a micro-core architecture, a micro-service architecture, or a cloud architecture. In the embodiment of the invention, taking an Android system with a layered architecture as an example, a software structure of the terminal 100 is illustrated.

Fig. 2 is a software configuration block diagram of the terminal 100 according to the embodiment of the present invention.

The layered architecture divides the software into several layers, each with distinct roles and branches. The layers communicate with each other through a software interface. In some embodiments, the Android system is divided into four layers, from top to bottom, an application layer, an application framework layer, an Zhuoyun rows (Android runtime) and system libraries, and a kernel layer, respectively.

The application layer may include a series of application packages.

As shown in fig. 2, the application package may include applications for cameras, gallery, calendar, phone calls, maps, navigation, WLAN, bluetooth, music, video, short messages, etc.

The application framework layer provides an application programming interface (application programming interface, API) and programming framework for the application of the application layer. The application framework layer includes a number of predefined functions.

As shown in FIG. 2, the application framework layer may include a window manager, a content provider, a view system, a telephony manager, a resource manager, a notification manager, and the like.

The window manager is used for managing window programs. The window manager can acquire the size of the display screen, judge whether a status bar exists, lock the screen, intercept the screen and the like.

The content provider is used to store and retrieve data and make such data accessible to applications. The data may include video, images, audio, calls made and received, browsing history and bookmarks, phonebooks, etc.

The view system includes visual controls, such as controls to display text, controls to display pictures, and the like. The view system may be used to build applications. The display interface may be composed of one or more views. For example, a display interface including a text message notification icon may include a view displaying text and a view displaying a picture.

The telephony manager is used to provide the communication functions of the terminal 100. Such as the management of call status (including on, hung-up, etc.).

The resource manager provides various resources for the application program, such as localization strings, icons, pictures, layout files, video files, and the like.

The notification manager allows the application to display notification information in a status bar, can be used to communicate notification type messages, can automatically disappear after a short dwell, and does not require user interaction. Such as notification manager is used to inform that the download is complete, message alerts, etc. The notification manager may also be a notification in the form of a chart or scroll bar text that appears on the system top status bar, such as a notification of a background running application, or a notification that appears on the screen in the form of a dialog window. For example, a text message is prompted in a status bar, a prompt tone is emitted, the electronic device vibrates, and an indicator light blinks, etc.

Android run time includes a core library and virtual machines. Android runtime is responsible for scheduling and management of the android system.

The core library consists of two parts: one part is a function which needs to be called by java language, and the other part is a core library of android.

The application layer and the application framework layer run in a virtual machine. The virtual machine executes java files of the application program layer and the application program framework layer as binary files. The virtual machine is used for executing the functions of object life cycle management, stack management, thread management, security and exception management, garbage collection and the like.

The system library may include a plurality of functional modules. For example: surface manager (surface manager), media Libraries (Media Libraries), three-dimensional graphics processing Libraries (e.g., openGL ES), 2D graphics engines (e.g., SGL), etc.

The surface manager is used to manage the display subsystem and provides a fusion of 2D and 3D layers for multiple applications.

Media libraries support a variety of commonly used audio, video format playback and recording, still image files, and the like. The media library may support a variety of audio and video encoding formats, such as MPEG4, h.264, MP3, AAC, AMR, JPG, PNG, etc.

The three-dimensional graphic processing library is used for realizing three-dimensional graphic drawing, image rendering, synthesis, layer processing and the like.

The 2D graphics engine is a drawing engine for 2D drawing.

The kernel layer is a layer between hardware and software. The inner core layer at least comprises a display driver, a camera driver, an audio driver and a sensor driver.

Fig. 3A depicts a scenario in which the terminal 100 initiates an emergency call in an area covered by the PLMN-1 network. Referring to fig. 3a, PLMN-1 may represent a PLMN provided by operator a. The HPLMN of the terminal 100 is PLMN-2, and the SIM card of the terminal 100 may contain HPLMN information of the terminal 100, where PLMN-2 may represent a PLMN provided by the operator B. The base station 301 is for accessing a PLMN-1 network provided by operator a. The terminal 100 may initiate an emergency call request in the area covered by the PLMN-1 network, where an emergency call refers to a special call service performed by the terminal by dialing numbers such as 110, 120, 911, etc. when the user encounters an emergency in the flight mode. Illustratively, a user first turns on an emergency call function on the terminal 100, the terminal 100 turns off an air mode, initiates a network search, searches for available PLMN-1, the terminal 100 requests registration to the PLMN-1 network, and after registering the terminal 100 to the PLMN-1 network, the terminal sends an emergency call request to the PLMN-1 network through the base station 301. The emergency call request transmitted by the terminal 100 is processed through an emergency call processing system of the PLMN-1 network. However, the PLMN-1 network is not the HPLMN network of the terminal 100, and the emergency call processing system of the PLMN-1 network may reject the emergency call request, resulting in an emergency call failure.

Fig. 3B depicts a scenario in which the terminal 100 initiates an emergency call in a multi-operator shared network (MOCN-operator core network). In the MOCN network, the same area may be covered by networks of multiple operators at the same time. The terminal 100 may access PLMNs of different operators through the same base station 301, and the different operators share access networks, frequency points and cells by using MOCNs.

Referring to fig. 3B, PLMN-1 may represent a PLMN provided by operator a, PLMN-2 may represent a PLMN provided by operator B, and PLMN-3 may represent a PLMN provided by operator C. The HPLMN of terminal 100 is PLMN-2. The base station broadcasts a corresponding PLMN list in the current terminal area through a system message 1 (SystemInformationBlockType, SIB 1), for example, the PLMN list includes PLMN-1, PLMN-2 and PLMN-3. PLMNs in the PLMN list have priorities, which may be preset by the operator, e.g., PLMN-1 has a priority greater than PLMN-2, and PLMN-2 has a priority greater than PLMN-3, which may indicate the order in which the user requests registration to the corresponding network when searching for networks. For example, when the user starts the emergency call function on the terminal 100, the terminal 100 closes the flight mode, and after receiving the system message SIB1 sent by the base station 301, the terminal requests to register in the corresponding network according to the priority of the PLMN in the PLMN list, and initiates an emergency call after successful registration. For example, when the PLMN list is started up and the network is searched, the terminal 100 initiates a registration request to the PLMN-1 after acquiring the PLMN list, and initiates an emergency call request through the PLMN-1 network after successfully registering to the PLMN-1 network. However, the emergency call request transmitted by the terminal 100 is processed through an emergency call processing system of the PLMN-1 network. Since the PLMN-1 network is not the HPLMN network of the terminal 100, the emergency call processing system of the PLMN-1 network may reject the emergency call request, resulting in an emergency call failure.

Fig. 4 is a flowchart of a network selection method according to an embodiment of the present application. The network selection method can be applied to MOCN networks, and the terminal is in a flight mode, so that a user opens an emergency call function. Referring to fig. 4, the network selection method may include the steps of:

Step 410: when the user starts the emergency call function in the flight mode, the terminal can acquire the PLMN information of the SIM card, wherein the PLMN information of the SIM card comprises the HPLMN information of the terminal. The terminal shuts down the flight mode. After the terminal turns off the flight mode, the system message broadcasted by the base station can be received.

Step 420: the terminal receives SIB1 system information broadcast by the base station. The SIB1 system information broadcast by the base station comprises a PLMN list in the area where the current terminal is located. After receiving the system message SIB1, the terminal analyzes the system message SIB1 to obtain a PLMN list.

Step 430: the terminal inquires whether the PLMN list contains the HPLMN of the terminal according to the acquired PLMN list, and if the PLMN list contains the HPLMN of the terminal, step 440 is executed. The PLMNs have unique PLMN IDs for identifying different PLMNs. Whether the HPLMN is contained can be known by querying the PLMN ID. For example, the obtained PLMN list includes three PLMNs, wherein PLMN IDs of the three PLMNs are PLMN-1, PLMN-2 and PLMN-3, respectively, and PLMN ID of HPLMN of the terminal is PLMN-2. After the terminal inquires that PLMN-2 is included in the PLMN list, step 440 is performed.

Step 440: the terminal selects an HPLMN network, wherein the selection of the HPLMN network indicates that the terminal initiates a registration request to the network, and after the registration is successful, the terminal can initiate an emergency call request through the HPLMN network.

Step 450: if the PLMN list does not contain the HPLMN of the terminal, it is queried whether the PLMN list contains an equivalent home public mobile network (equivalent home public land mobile network, EHPLMN) of the terminal. The EHPLMN is a PLMN that is co-located with the HPLMN of the terminal. The EHPLMN also has a PLMN ID for identifying a different EHPLMN from which a query may be made, if any, step 460 is performed.

Step 460: the terminal selects EHPLM a network, wherein selecting EHPLM the network means that the terminal initiates a registration request to the network, and after the registration is successful, the terminal can initiate an emergency call request through the EHPLMN network.

Step 470: if EHPLM of the terminal is not included in the PLMN list, the terminal selects a PLMN with high priority according to the priority of the PLMN network in the PLMN list, and initiates a registration request to the PLMN with high priority.

Step 480: after registering with the selected network, the terminal initiates an emergency call request through the selected network, and the selected network of the terminal receives the emergency call request and performs the emergency call task.

Fig. 5 is a signaling interaction diagram of a network selection method according to an embodiment of the present application. Referring to fig. 5, the network selection method may include the steps of:

step S501: and in the flight mode, after detecting the operation of starting the emergency call function by the user, the terminal acquires the PLMN information of the SIM card, wherein the PLMN information of the SIM card comprises the HPLMN information of the terminal, and the terminal closes the flight mode. After the terminal closes the flight mode, network searching can be started.

Step S502: and the base station sends an SIB1 system message to the terminal through broadcasting, wherein the SIB1 system message comprises a PLMN list in the area where the current terminal is located.

Step S503: after receiving the system message SIB1, the terminal analyzes the system message SIB1 to obtain a PLMN list.

Step S504: after the terminal acquires the PLMN list, inquiring whether the PLMN list contains the HPLMN of the terminal, and if the PLMN list contains the HPLMN of the terminal, selecting the HPLMN network by the terminal, wherein selecting the HPLMN network means that the terminal initiates a registration request to the network, and after the registration is successful, the terminal can initiate an emergency call request through the HPLMN network. If the HPLMN of the terminal is not included, inquiring whether EHPLM of the terminal is included in the PLMN list, if EHPLM of the terminal is included, selecting the EHPLM network by the terminal, wherein selecting EHPLM the network indicates that the terminal initiates a registration request to the network, and after the registration is successful, the terminal can initiate an emergency call request through the EHPLMN network. If EHPLM of the terminal is not included, the terminal selects a PLMN with high priority according to the priority of the PLMN network in the PLMN list, and initiates a registration request to the PLMN with high priority.

Step S505: and the terminal initiates an emergency call request after the selected network is successfully registered. The network selected by the terminal receives the emergency call request and performs the emergency call task through an emergency call system of the network.

By the method, when a user starts an emergency call function of the terminal in the MOCN network, the terminal can acquire HPLMN information in the SIM, close the flight mode, acquire a PLMN list in the area by analyzing a system message SIB1 broadcasted by the base station, and query according to the PLMN ID based on the acquired PLMN list, so that the HPLMN network and the EHPLMN network in the PLMN list are preferentially selected. After the terminal is successfully registered in the selected HPLMN network or EHPLMN network, an emergency call request can be initiated through the selected HPLMN network or EHPLMN network, the selected HPLMN network or EHPLMN network receives the emergency call request, and the emergency call task is executed through an emergency call system of the network, so that the success rate of emergency call is improved.

From the foregoing description of the embodiments, it will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of functional modules is illustrated, and in practical application, the above-described functional allocation may be implemented by different functional modules according to needs, i.e. the internal structure of the apparatus is divided into different functional modules to implement all or part of the functions described above. The specific working processes of the above-described systems, devices and units may refer to the corresponding processes in the foregoing method embodiments, which are not described herein.

The functional units in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The foregoing is merely an embodiment of the present application, but the scope of the embodiment of the present application is not limited thereto, and any changes or substitutions within the technical scope of the embodiment of the present application should be covered by the scope of the embodiment of the present application. Therefore, the protection scope of the embodiments of the present application shall be subject to the protection scope of the claims.

Claims (9)

1. A method of network selection, the method comprising:

acquiring an identification of a home public mobile network (HPLMN);

Acquiring a land public mobile network (PLMN) list, wherein PLMNs in the PLMN list are arranged according to a priority order, the PLMNs are provided with identifications, and the priority order is a priority order preset by an operator;

determining whether the PLMN list includes an HPLMN;

Selecting the HPLMN when it is determined that the PLMN list includes the HPLMN;

Determining whether the PLMN list contains an Equivalent Home Public Land Mobile Network (EHPLMN) when it is determined that the PLMN list does not contain the HPLMN;

selecting the EHPLMN when it is determined that the PLMN list includes the EHPLMN;

And when the PLMN list does not contain the EHPLMN, selecting the PLMN in the PLMN list according to the priority order of the PLMNs in the PLMN list.

2. The method of claim 1, wherein the determining whether the PLMN list includes the HPLMN comprises:

Analyzing the PLMN list to obtain the identification of the PLMN;

Inquiring whether the identification of the HPLMN is contained or not according to the identification of the PLMN in the PLMN list;

and determining whether the PLMN list contains the HPLMN according to the query result.

3. The method of claim 1, wherein the determining whether the PLMN list includes the EHPLMN comprises:

Analyzing the PLMN list to obtain the identification of the PLMN;

Inquiring whether the identification of the EHPLMN is contained or not according to the identification of the PLMN in the PLMN list;

and determining whether the PLMN list contains the EHPLMN according to the query result.

4. A method according to any one of claims 1-3, wherein the method further comprises:

Before acquiring the identification of the HPLMN, detecting the operation of starting an emergency call function by a user;

and switching off the flight mode between the steps of acquiring the identification of the HPLMN and acquiring the PLMN list.

5. A method according to any of claims 1-3, characterized in that the method is applied to a multi-operator shared network (MOCN).

6. A terminal, which is characterized by comprising a touch screen, a memory and a processor; wherein the memory stores one or more computer programs;

wherein the processor is configured to: acquiring an identification of a home public mobile network (HPLMN); acquiring a land public mobile network (PLMN) list, wherein PLMNs in the PLMN list are arranged according to a priority order, the PLMNs are provided with identifications, and the priority order is a priority order preset by an operator; determining whether the PLMN list includes an HPLMN; selecting the HPLMN when it is determined that the PLMN list includes the HPLMN;

The processor is further configured to: determining whether the PLMN list contains an Equivalent Home Public Land Mobile Network (EHPLMN) when it is determined that the PLMN list does not contain the HPLMN; selecting the EHPLMN when it is determined that the PLMN list includes the EHPLMN;

The processor is further configured to: and when the PLMN list does not contain the EHPLMN, selecting the PLMN in the PLMN list according to the priority order of the PLMNs in the PLMN list.

7. The terminal of claim 6, wherein the processor is further configured to: analyzing the PLMN list to obtain the identification of the PLMN; inquiring whether the identification of the HPLMN is contained or not according to the identification of the PLMN in the PLMN list; and determining whether the PLMN list contains the HPLMN according to the query result.

8. The terminal of claim 6 or 7, wherein the processor is further configured to: analyzing the PLMN list to obtain the identification of the PLMN; inquiring whether the identification of the EHPLMN is contained or not according to the identification of the PLMN in the PLMN list; and determining whether the PLMN list contains the EHPLMN according to the query result.

9. The terminal of claim 6 or 7, wherein the processor is further configured to: before acquiring the identification of the HPLMN, detecting the operation of starting an emergency call function by a user; and switching off the flight mode between the steps of acquiring the identification of the HPLMN and acquiring the PLMN list.